Refrigerating apparatus
A refrigeration device and refrigeration oil technology, applied in the direction of refrigerators, refrigeration components, refrigeration and liquefaction, etc., to achieve good operating efficiency, simple structure, and reduce rotation resistance
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Deformed example 1-
Modification 1 of the embodiment will be described below. A refrigerant circuit diagram of a refrigeration system (1) according to Modification 1 is shown in FIG. 4 . In the refrigerating device (1) of Modification 1, the connection position of the oil return channel (72) is different from the above embodiment.
[0056] Specifically, one end of the oil return channel (72) is connected to the oil return pipe (65) connected to the oil separator (64), and the other end is connected to the refrigerant pipe (60) by bypassing the pressure regulating valve (71). Same as the above embodiment, a solenoid valve (73) is provided in the oil return passage (72). Furthermore, unlike the above-mentioned embodiment, an electromagnetic valve (66) is provided on the oil return pipe (65).
[0057] In modification 1, the solenoid valve (66) of the oil return pipe (65) and the solenoid valve (73) of the oil return passage (72) are controlled so that the refrigeration compressor (55) collected by ...
Deformed example 2-
Modification 2 of the embodiment will be described below. A refrigerant circuit diagram of a refrigeration system (1) according to Modification 2 is shown in FIG. 5 . In the refrigeration device (1) of Modification 2, the oil return mechanism (70) includes a first oil return passage (72a) and a second oil return passage (72b). The connection position of the first oil return passage (72a) is the same as that of the above-mentioned embodiment, and the connection position of the second oil return passage (72b) is the same as that of the first modification.
[0059] In Modification 2, the first oil return passage (72a) is usually used when the oil return mechanism (70) returns the refrigerating oil from the refrigeration compressor (55) to the first and second compressors (11, 12). In other words, the solenoid valve (73a) of the first oil return passage (72a) is opened, and the solenoid valve (73b) of the second oil return passage (72b) is closed. The second oil return passage (7...
Deformed example 3-
Modification 3 of the embodiment will be described below. A refrigerant circuit diagram of a refrigeration system (1) according to Modification 3 is shown in FIG. 6 . The refrigeration apparatus (1) of modification 3 differs from the above-mentioned embodiment in that a plurality of refrigeration compressors (55a, 55b, 55c) constitute the low stage compressor of the refrigeration unit (5). In addition, although three refrigerating compressors (55a, 55b, 55c) are provided in the refrigerant circuit (6) in Modification 3, the number of these refrigerating compressors (55a, 55b, 55c) is simply For example, two or more refrigeration compressors (55a, 55b, 55c) may be installed in the refrigerant circuit (6).
[0061] Specifically, in the refrigerating unit (5), the 1st refrigerating compressor (55a), the 2nd refrigerating compressor (55b), and the 3rd refrigerating compressor (55c) are connected in the refrigerating cooler (56 ) and the oil separator (64) are connected in paralle...
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